Electrostatics Archives - Page 5 of 11 - MCQ and Quiz for Exams

41. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

2 joules

4 joules

6 joules

8 joules

Detailed SolutionWhen 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

42. Mica capacitors are characterised by all of the following except

stable operation

accurate value

low leakage reactance

low losses

Detailed SolutionMica capacitors are characterised by all of the following except

43. In a cable capacitor, voltage gradient is maximum at the surface of the

earth

conduction

sheath

insulator

Detailed SolutionIn a cable capacitor, voltage gradient is maximum at the surface of the

44. The unit of capacitance is

henry

ohm

farad

farad/m

Detailed SolutionThe unit of capacitance is

45. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to . . . . . . . . percent of its . . . . . . . . value.

37, initial

62, initial

62, final

37, final

Detailed SolutionThe time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to . . . . . . . . percent of its . . . . . . . . value.

46. An electrolytic capacitor is generally made to provide

low capacitance

fixed capacitance

variable capacitance

large value of capacitance

Detailed SolutionAn electrolytic capacitor is generally made to provide

47. Which of the following capacitors preferred for high frequency circuits ?

Air capacitor

Electrolytic capacitor

Mica capacitor

none of the above

Detailed SolutionWhich of the following capacitors preferred for high frequency circuits ?

48. If three 15 uF capacitors are connected in series, the net capacitance is

5 uF

30 uF

45 uF

50 uF

Detailed SolutionIf three 15 uF capacitors are connected in series, the net capacitance is

49. Out of the following capacitors of identical rating which one will have the smallest dimensions ?

Aluminium foil capacitor

Mica capacitor

Ceramic capacitor

Paper capacitor

Detailed SolutionOut of the following capacitors of identical rating which one will have the smallest dimensions ?

50. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

decrease

increase

remains unchanged

become zero

Detailed SolutionIf the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

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